On 10/28/2010 9:56 AM, toodamnfunky@comcast.net wrote:
> FoT,
>
> Does anyone have any TR-4 head flow data. I'm thinking of going to the big
>valves
>
> so I decided it's time to get smart on the subject.
>
Jim, unfortunately I have no way to measure CFM, but here is some
anecdotal data. In my TR4's previous build I had an Isky 777 cam,
ported head (1.5" intake all the way to the seat), polished exhausts,
standard valves and dual 40 DCOEs. At 1000 idle I could easily hold my
hand right at the tail pipe. I had Isky reduce the duration on the 777
to come on the cam at 3K instead of 3.5K (I think the grind is GM-72,
can find that if you need it) and I used BFE's oversize valves (which
are gas-flowed, and a work of art - I hated to get them dirty) on intake
and exhaust. Same head and carbs. Now I can't hold my hand closer than
about 8-10". At idle (1K) the exhaust will vigorously flap my jeans leg
from 3' away.
This is clearly not scientific but I'm very impressed w/Ken's valves.
The engine pumps a *lot* more air than with the standard valves. Ken
may have flow data, I didn't think to ask him at the time.
hth
jim
>
>
> > From TeriAnn's website discussing webers.
>
> "optimum gas speed" for best flow was 325 fps.
>
>
>
> "this might explain a little why lots of times increasing the size of the
>inlet valves does
>
> NOTHING for the power and may even be a deterrent."
>
>
>
> I use the mikuni hsr45 smooth bores which flow at 237 CFM.
>
> I'm just trying to put things into some perspective.
>
>
>
> Jim G.
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>
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>
--
Jim Hassall
Blacksburg VA
'63 TR4 in autox preparation
99% finished, 90% to go
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